package cn.edu.swu.gyt.auth;

import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import jakarta.servlet.http.HttpSession;

import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;


@WebServlet(urlPatterns = "/captcha")
public class CaptchaServlet extends HttpServlet {
    public final static String CAPTCHA_KEY="CAPTCHA_KEY";
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException{
        CaptchaGenerator defaultGenerator = new CaptchaGenerator();
        CaptchaGenerator.CaptchaInfo captcha = defaultGenerator.generate();

        HttpSession session=request.getSession(true);
        session.setAttribute(CAPTCHA_KEY,captcha.getCode());

        try (OutputStream outputStream=response.getOutputStream()){
            response.setContentType("image/png");
            captcha.writeToStream(outputStream);
            outputStream.flush();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}
